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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on January 9, 1999. Coordinates are given as of the end of the day.
| Group ID | Location | Number of sunspots | Area (msh) | Type | CM Passage | Disappearance (W90) | Reappearance (W270) | |
|---|---|---|---|---|---|---|---|---|
| № 8435 | N12 | W01 | 01 | 0000 | ALPHA | Jan 10, 1999 | Jan 17, 1999 | Jan 31, 1999 |
| № 8434 | S27 | E31 | 05 | 0010 | BETA | Jan 13, 1999 | Jan 20, 1999 | Feb 3, 1999 |
| № 8433 | S28 | W08 | 05 | 0020 | BETA | Jan 10, 1999 | Jan 17, 1999 | Jan 31, 1999 |
| № 8432 | N26 | W82 | 01 | 0000 | ALPHA | Jan 4, 1999 | Jan 11, 1999 | Jan 25, 1999 |
| № 8431 | S28 | E15 | 07 | 0010 | BETA | Jan 11, 1999 | Jan 19, 1999 | Feb 2, 1999 |
| № 8430 | S28 | W07 | 07 | 0030 | BETA | Jan 10, 1999 | Jan 17, 1999 | Jan 31, 1999 |
| № 8426 | N14 | W54 | 03 | 0080 | BETA | Jan 6, 1999 | Jan 13, 1999 | Jan 27, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to January 1999. The gray background is the average SSN index.
